Text-Based Adventure Without Using "States" - C# Unity

I am currently learning C# and the Unity3D game engine. I am moving through the online course "Learn to Code by Making Video Games" and like it so far. However, I am on the second project (Making a 'text-based' adventure), and I feel like the way that the instructor built the game wouldn't really scale very well if you wanted more than a dozen 'rooms' or actions. I am hoping that someone could possibly point me in the right direction for something that is a little more flexible?

Here is a really streamlined version of what he currently is having us do:

While this does end up working, I feel like this is a really clunky system and gets unruly after just a dozen or so states, as I have to go back and add the conditional statement for every new state after I make it. Isn't there a way to make a really simple "check what state is, and go to that one" command in the void Update function instead of listing each and every possible one?

Like I said, I am fairly new to C# (done some work in PHP, HTML, CSS, but nothing as brutal as C#) so I am not sure if this is even something that I can do.

A State Machine is actually one of the most common mechanisms for game development, and you would be hard pressed to find a method that more efficiently organizes your game logic. That being said, you should not be using a series of if statements to check which state is currently active, because you are absolutely right - that method will not scale well at all.

The obvious alternative would be to use a switch block, but while that is far more efficient than an if series, it doesn't help with the whole code maintainability issue.

I'm sure that something like this is what your tutorial series was going to result in anyway, so it probably would be best that you finish the series before asking these kinds of questions. It's a common tactic in tutorials to present an example like this, then in the next lesson go "now that you understand the principle, let's implement it in a way that's not complete crap".